Cellulose nanofibrils-based thermally conductive composites for flexible electronics: a mini review

The natural world abounds in lignocellulosic biomass, which is an environmentally friendly renewable resource. Cellulose nanofibrils (CNFs) made from biomass have the advantages of high optical transparency, light weight, good mechanical properties, high specific surface area and biodegradability. Increasing applications of CNFs have been identified in emerging high-tech fields, such as flexible electronics and clean energy. A variety of thermal management materials have been discussed in flexible electronic products. This paper reviews the merits of CNFs compared to other polymers in flexible electronic products and emphasizes the application status of CNF-based thermal management materials in flexible electronic products. The thermal conductivities of the CNF-based composites are analyzed with respect to the heat transfer mechanism, the thermal conductivity of the polymer, the loading of the filler, the size and morphology of the filler, the type of filler, and the surface treatment of the filler. Current challenges and future research opportunities are also discussed, offering a reasonable and scientific route for the structural design of future flexible thermal management materials that will promote the development of the flexible electronics industry.